It would be good if GSX and EZDOK would talk to each other and find a way that you could work with both programs parallel..
The only possible way for the two working together, would be that Ezdok would temporarily disable its usage of the cursor keys, while GSX is editing. But, of course, you'll lose Ezdok functionality, which kind defeats the purpose of having Ezdok helping with the editing.
So, the only real solution, would be finding a way for Ezdok to use other means to control the camera, like a joystick, so the cursor keys could be free for GSX to use. Moving GSX vehicles with the joystick would be impractical, but a camera should work just fine.